补数

补数	bǔ shù	complementary number
补	bǔ	to repair / to patch / to mend / to make up for / to fill (a vacancy) / to supplement
数	shǔ	to count / to count as; to regard as / to enumerate; to list
数	shù	number; figure / several; a few
数	shuò	(literary) frequently; repeatedly